BRC-22
< SYSTEM DESCRIPTION >[VDC/TCS/ABS]
SYSTEM
VDC/TCS/ABS : VDC Function
INFOID:0000000012430837
SYSTEM DIAGRAM
SYSTEM DESCRIPTION
• Side slip or tail slip may occur while driving on a slippery road or intending an urgent evasive driving maneu-
ver. VDC function detects side slip status using each s ensor when side slip or tail slip is about to occur and
improves vehicle stability by brake cont rol and engine output control during driving.
• In addition to ABS function, EBD function and TCS functi on, target side slip amount is calculated according
to steering operation amount from steering angle sensor. By comparing this information with vehicle side slip
amount that is calculated from information from yaw rate/side G sensor and wheel sensor, vehicle driving
conditions (conditions of understeer or oversteer) are judged and vehicle stability is improved by brake force
control on all 4 wheels and engine output control.
• VDC function can be switched to non-operational status (OFF) by operating VDC OFF switch. In this case,
VDC OFF indicator lamp turns ON.
• Control unit portion automatically improves driving stability by performing brake force control as well as
engine output control, by transmitting drive signal to actuator portion according to difference between target
side slip amount and vehicle side slip amount
VDC function is operating OFFOFF
TCS function is operating OFFOFF
Condition (status)
ABS warning lampBrake warning lamp
AWFIA0807GB
JSFIA0672GB
Revision: August 2015 2016 Versa Note
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SYSTEMBRC-23
< SYSTEM DESCRIPTION > [VDC/TCS/ABS]
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• Brake force control function at braking hard detects driver ′s brake operations with the pressure sensor,
judges a brake booster ′s maximum brake power function by using information from the vacuum sensor, and
enhances more powerful braking force by controlling brakes of four wheels.
• VDC warning lamp blinks while VDC function is in operat ion and indicates to the driver that the function is in
operation.
• CONSULT can be used to diagnose the system.
• Fail-safe function is adopted. When a malfunction occurs in VDC function, the control is suspended for VDC
function and TCS function. However, ABS function and EBD function operate normally. Refer to BRC-39,
"Fail-safe".
INPUT SIGNAL AND OUTPUT SIGNAL
Major signal transmission between each unit via communication lines is shown in the following table.
OPERATION CHARACTERISTICS
VDC Function That Prevents Oversteer Tendency
• During cornering, brake force (brake fluid pressure) is applied on front wheel and rear wheel on the outer
side of turn. Momentum is generated directing the vehicle toward the outer side of the turn. Oversteer is pre-
vented.
• Changing driving lane on a slippery road, when there may be a tendency to oversteer, engine output is con-
trolled as well as brake force (brake fluid pr essure) of 4 wheels. Oversteer tendency decreases.
Component Signal description
ECM Transmits the following signals to ABS actuator an
d electric unit (control unit) via CAN commu-
nication:
• Acceleration pedal position signal
• Engine speed signal
• Target throttle position signal
TCM Transmits the current gear positi
on signal to ABS actuator and electric unit (control unit) via
CAN communication.
Steering angle sensor Transmits the steering an
gle sensor signal to ABS actuator an d electric unit (control unit) via
CAN communication.
Combination meter Transmits the following signals to ABS actuator an
d electric unit (control unit) via CAN commu-
nication:
• Brake fluid level switch signal
• parking brake switch signal
Receives the following signals from ABS actuator and electric unit (control unit) via CAN com-
munication:
• VDC OFF indicator lamp signal
• SLIP indicator lamp signal
ALFIA0339GB
ALFIA0340GB
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SYSTEMBRC-25
< SYSTEM DESCRIPTION > [VDC/TCS/ABS]
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• Wheel spin status of drive wheel is detected by wheel sensor of 4 wheels. Engine output and transmission shift status is controlled
so that slip rate of drive wheels is in appropriate level. When wheel
spin occurs on drive wheel, ABS ac tuator and electric unit (control
unit) perform brake force control of LH and RH drive wheels (apply
brake force by increasing brake fluid pressure of drive wheel) and
decrease engine torque by engine torque control. Wheel spin
amount decreases. Engine torque is controlled to appropriate
level.
• TCS function can be switched to non-operational status (OFF) by
operating VDC OFF switch. In this case, VDC OFF indicator lamp
turns ON.
• SLIP indicator lamp blinks while TCS function is in operation and
indicates to the driver that the function is in operation.
• CONSULT can be used to diagnose the system.
• Fail-safe function is adopted. When a malfunction occurs in TCS function, the control is suspended for VDC function and TCS func-
tion. However, ABS function and EBD function operate normally.
Refer to BRC-39, "
Fail-safe".
INPUT SIGNAL AND OUTPUT SIGNAL
Major signal transmission between each unit via communication lines is shown in the following table.
JPFIC0139GB
Component Signal description
ECM Transmits the following signals to ABS actuator an
d electric unit (control unit) via CAN commu-
nication:
• Accelerator pedal position signal
• Engine speed signal
• Target throttle position signal
TCM Transmits the current gear positi
on signal to ABS actuator and electric unit (control unit) via
CAN communication.
Steering angle sensor Transmits the steering an
gle sensor signal to ABS actuator an d electric unit (control unit) via
CAN communication.
Combination meter Transmits the following signals to ABS actuator an
d electric unit (control unit) via CAN commu-
nication:
• Brake fluid level switch signal
• Parking brake switch signal
Receives the following signals from ABS actuator and electric unit (control unit) via CAN com-
munication:
• VDC OFF indicator lamp signal
• SLIP indicator lamp signal
Revision: August 2015 2016 Versa Note
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BRC-28
< SYSTEM DESCRIPTION >[VDC/TCS/ABS]
SYSTEM
• During braking, control unit portion compares slight slip on front
and rear wheels by wheel speed sensor signal, transmits drive sig-
nal to actuator portion when rear wheel slip exceeds front wheel
slip for the specified value or more, and controls rear wheel brake
force (brake fluid pressure) so that increase of rear wheel slip is
prevented and slips on front wheel and rear wheel are nearly
equalized. ABS control is applied when slip on each wheel
increases and wheel speed is the threshold value of ABS control or
less.
• CONSULT can be used to diagnose the system.
• Fail-safe function is adopted. When a malfunction occurs in EBD function, the control is suspended for VDC function, TCS function,
ABS function and EBD function. Refer to BRC-28, "
VDC/TCS/ABS
: Fail-safe".
INPUT SIGNAL AND OUTPUT SIGNAL
Major signal transmission between each unit via communication lines is shown in the following table.
VDC/TCS/ABS : Fail-safeINFOID:0000000012430841
VDC AND TCS FUNCTIONS
VDC warning lamp in combination meter turns ON when a malfunction occurs in system [ABS actuator and
electric unit (control unit)]. The control is su spended for VDC and TCS functions. However, ABS and EBD
functions operate normally.
ABS FUNCTION
ABS warning lamp and SLIP indicator lamp in combi nation meter turn ON when a malfunction occurs in sys-
tem [ABS actuator and electric unit (control unit)]. The control is suspended for VDC, TCS and ABS functions.
However, EBD functions operate normally.
EBD FUNCTION
ABS warning lamp, brake warning lamp and SLIP indicator lamp in combination meter turn ON when a mal-
function occurs in system [ABS ac tuator and electric unit (control unit) ]. The control is suspended for VDC,
TCS, ABS and EBD functions.
JPFIC0143GB
Component Signal description
Combination meter Receives the following signals from ABS actuator
and electric unit (control unit) via CAN com-
munication:
• ABS warning lamp signal
• Brake warning lamp signal
• SLIP indicator lamp signal
Revision: August 2015 2016 Versa Note
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DIAGNOSIS SYSTEM [ABS ACTUATOR AND ELECTRIC UNIT (CONTROL
UNIT)]
BRC-31
< SYSTEM DESCRIPTION > [VDC/TCS/ABS]
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DIAGNOSIS SYSTEM [ABS ACTUATOR AND ELECTRIC UNIT (CONTROL
UNIT)]
CONSULT Function (ABS)INFOID:0000000012430842
APPLICATION ITEMS
CONSULT can display each diagnostic item us ing the following direct diagnostic modes.
ECU IDENTIFICATION
ABS actuator and electric unit (control unit) part number is displayed.
SELF DIAGNOSTIC RESULT
Operation Procedure
1. Before performing the “Self Diagnostic Result”, st art engine and drive vehicle at 30 km/h (19 MPH) or
more for approximately 1 minute.
How To Erase Self Diagnostic Result
1. After erasing DTC memory, start engine and drive vehicle at 30 km/h (19 MPH) or more for approximately 1 minute as the final inspection, and make sure t hat the ABS warning lamp, VDC OFF indicator lamp,
SLIP indicator lamp and brake warning lamp turn OFF.
CAUTION:
If memory cannot be erased, perform applicable diagnosis.
NOTE:
• When the wheel sensor malfunctions, after inspecting the wheel sensor system, the ABS warning lamp,
SLIP indicator lamp and brake warning lamp will not turn OFF even when the system is normal, unless
the vehicle is driven at approximately 30 km/h (19 MPH) or more for approximately 1 minute.
• Brake warning lamp will turn ON in case of parking brake operation (when switch is ON) or of brake fluid
level switch operation (when brake fluid is insufficient).
• VDC OFF switch should not stay in ON position.
Display Item List
Refer to BRC-43, "DTC Index".
DATA MONITOR
Direct Diagnostic Mode Description
ECU Identification The ABS actuator and electric unit (control unit) part number is displayed.
Self Diagnostic Result The ABS actuator and electric unit (control unit) self diagnostic results are displayed.
Data Monitor The ABS actuator and electric unit (control unit) input/output data is displayed in real time.
Active Test The ABS actuator and electric unit (control unit) activates outputs to test components.
Work support The settings for ABS actuator and electric unit (control unit) functions can be changed.
CAN DIAG SUPPORT MNTR The result of transmit/receive diagnosis of CAN communication is displayed.
Item
(Unit) Data monitor item selection
Remarks
ECU INPUT
SIGNALS MAIN
SIGNALS SELECTION
FROM MENU
FR LH SENSOR
(km/h, mph) ×× × Wheel speed (km/h, mph) calculated by front wheel
sensor LH signal is displayed.
FR RH SENSOR
(km/h, mph) ×× × Wheel speed (km/h, mph) calculated by front wheel
sensor RH signal is displayed.
RR LH SENSOR
(km/h, mph) ×× ×
Wheel speed (km/h, mph) calculated by rear wheel
sensor LH signal is displayed.
RR RH SENSOR
(km/h, mph) ×× × Wheel speed (km/h, mph) calculated by rear wheel
sensor RH signal is displayed.
Revision: August 2015
2016 Versa Note
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DIAGNOSIS SYSTEM [ABS ACTUATOR AND ELECTRIC UNIT (CONTROL
UNIT)]
BRC-33
< SYSTEM DESCRIPTION > [VDC/TCS/ABS]
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× : Applicable
–: Not applicable
ACTIVE TEST MODE
CAUTION:
• Do not perform active test while driving vehicle.
• Make sure to completely bleed air from brake system.
• The active test cannot be performed with the ABS warning lamp, VDC OFF indicator lamp, SLIP indi-
cator lamp or brake warning lamp on.
• ABS warning lamp, VDC OFF indi cator lamp, SLIP indicator lamp and brake warning lamp turn on
during active test.
NOTE:
• When active test is performed while depressing the pedal, the pedal depression amount will change. This is normal.
• “TEST IS STOPPED” is displayed 10 seconds after operation start.
• After “TEST IS STOPPED” is displayed, to perform test again, touch BACK.
Test Item
ABS SOLENOID VALVE• Select “Up”, “Keep” and “Down”. Then use screen monitor to check that solenoid valve operates as shown in
the table below.
SV1
(On/Off) ––
×Suction valve 1(On/Off) status is displayed.
SV2
(On/Off) ––
×Suction valve 2 (On/Off) status is displayed.
ACCEL POS SIG
(%) ×
– ×Throttle valve open/close status judged by CAN com-
munication signal is displayed.
SIDE G-SENSOR
(m/s
2) ×
– ×Transverse acceleration detected by side G-sensor is
displayed.
STR ANGLE SIG
(deg) ×
– ×Steering angle detected by steering angle sensor is
displayed.
PRESS SENSOR
(bar) ×
– ×Brake pressure detected by pressure sensor is dis-
played.
EBD SIGNAL
(On/Off) ––
×EBD operation (On/Off) status is displayed.
ABS SIGNAL
(On/Off) ––
×ABS operation (On/Off) status is displayed.
TCS SIGNAL
(On/Off) ––
×TCS operation (On/Off) status is displayed.
VDC SIGNAL
(On/Off) ––
×VDC operation (On/Off) status is displayed.
EBD FAIL SIG
(On/Off) ––
×EBD fail signal (On/Off) status is displayed.
ABS FAIL SIG
(On/Off) ––
×ABS fail signal (On/Off) status is displayed.
TCS FAIL SIG
(On/Off) ––
×TCS fail signal (On/Off) status is displayed.
VDC FAIL SIG
(On/Off) ––
×VDC fail signal (On/Off) status is displayed.
CRANKING SIG
(On/Off) ––
×The input state of the key SW START position signal
is displayed.
FLUID LEV SW
(On/Off) ×
– ×Brake fluid level switch (On/Off) status is displayed.
Item
(Unit) Data monitor item selection
Remarks
ECU INPUT
SIGNALS MAIN
SIGNALS SELECTION
FROM MENU
Revision: August 2015 2016 Versa Note
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ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)BRC-37
< ECU DIAGNOSIS INFORMATION > [VDC/TCS/ABS]
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RR RH OUT SOL Operation status of all solenoid valves Actuator (solenoid valve) is active (“AC-
TIVE TEST” with CONSULT) or actuator
relay is inactive (in fail-safe mode)
On
When the actuator (solenoid valve) is not
active and actuator relay is active (igni-
tion switch ON) Off
RR LH IN SOL Operation status of all solenoid valves Actuator (solenoid valve) is active (“AC-
TIVE TEST” with CONSULT) or actuator
relay is inactive (in fail-safe mode)
On
When the actuator (solenoid valve) is not
active and actuator relay is active (igni-
tion switch ON) Off
RR LH OUT SOL Operation status of all solenoid valves Actuator (solenoid valve) is active (“AC-
TIVE TEST” with CONSULT) or actuator
relay is inactive (in fail-safe mode)
On
When the actuator (solenoid valve) is not
active and actuator relay is active (igni-
tion switch ON) Off
EBD WARN LAMP EBD warning lamp
(Note 2) When EBD warning lamp is ON
On
When EBD warning lamp is OFF Off
STOP LAMP SW Brake pedal operation When brake pedal is depressed
On
When brake pedal is not depressed Off
MOTOR RELAY Motor and motor relay operation When the motor relay and motor are op-
erating
On
When the motor relay and motor are not
operating Off
ACTUATOR RLY Actuator relay operation When the actuator relay is operating
On
When the actuator relay is not operating Off
ABS WARN LAMP ABS warning lamp
(Note 2) When ABS warning lamp is ON
On
When ABS warning lamp is OFF Off
OFF LAMP VDC OFF indicator lamp
(Note 2) When VDC OFF indicator lamp is ON
On
When VDC OFF indicator lamp is OFF Off
OFF SW VDC OFF switch When VDC OFF switch is in ON
On
When VDC OFF switch is in OFF Off
SLIP/VDC LAMP SLIP indicator lamp
(Note 2) When SLIP indicator lamp is ON
On
When SLIP indicator lamp is OFF Off
BATTERY VOLT Battery voltage supplied
to the ABS actuator
and electric unit (control unit) Ignition switch ON
10 – 16 V
GEAR Manual mode gear position determined by
TCM 1st gear
2nd gear
3rd gear
4th gear
5th gear 1
2
3
4
5
SLCT LVR POSI Selector lever position. Vehicle stoppedN/P
ENGINE SPEED With engine runn ingWhen engine running RPM
YAW RATE SEN Yaw rate detected by yaw rate/side G sensor When vehicle stop
Approx. 0 d/s
When vehicle turning -75 to 75 d/s
R POSI SIG Transmission range switch signal ON/OFF
condition CVT shift position = R position
On
CVT shift position = other than R position Off
Monitor item
Display content Data monitor
Condition Reference value in
normal operation
Revision: August 2015 2016 Versa Note
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BRC-38
< ECU DIAGNOSIS INFORMATION >[VDC/TCS/ABS]
ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
N POSI SIGTransmission range switch signal ON/OFF
condition CVT shift position = N position
On
CVT shift position = other than N position Off
P POSI SIG Transmission range switch signal ON/OFF
condition CVT shift position = P position
On
CVT shift position = other than P position Off
CV1 ABS actuator cut valve 1 When the cut valve is active
On
When the cut valve is inactive Off
CV2 ABS actuator cut valve 2 When the cut valve is active
On
When the cut valve is inactive Off
SV1 ABS actuator suction valve When the suction valve is active
On
When the suction valve is inactive Off
SV2 ABS actuator suction valve 2 When the suction valve is active
On
When the suction valve is inactive Off
ACCEL POS SIG Throttle actuator opening/closing is dis-
played (linked with accelerator pedal) Accelerator pedal not depressed (ignition
switch is ON)
0 %
Depress accelerator pedal (ignition
switch is ON) 0 - 100 %
SIDE G-SENSOR Transverse G detected by side G sensor Vehicle stopped
Approx. 0 m/s
2
Vehicle turning rightNegative value
(m/s2)
Vehicle turning left Positive value
(m/s
2)
STR ANGLE SIG Steering angle detected by steering angle
sensor Straight-ahead
Approx. 0°
Steering wheel turned –720 to 720°
PRESS SENSOR Brake fluid pressure detected by pressure
sensor With ignition switch turned ON and brake
pedal released
Approx. 0 bar
With ignition switch turned ON and brake
pedal depressed –40 to 300 bar
EBD SIGNAL EBD operation EBD is active
On
EBD is inactive Off
ABS SIGNAL ABS operation ABS is active
On
ABS is inactive Off
TCS SIGNAL TCS operation TCS is active
On
TCS is inactive Off
VDC SIGNAL VDC operation VDC is active
On
VDC is inactive Off
EBD FAIL SIG EBD fail-safe signal In EBD fail-safe
On
EBD is normal Off
ABS FAIL SIG ABS fail-safe signal In ABS fail-safe
On
ABS is normal Off
TCS FAIL SIG TCS fail-safe signal In TCS fail-safe
On
TCS is normal Off
VDC FAIL SIG VDC fail-safe signal In VDC fail-safe
On
VDC is normal Off
Monitor item
Display content Data monitor
Condition Reference value in
normal operation
Revision: August 2015 2016 Versa Note
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